Temperature compensated resistive circuit

Details Temperature compensated resistive circuit Temperature compensated resistive circuit

1990-12-24

1992-04-21

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323907, 323315, 323267, G05F 326

Patent

active

051071991

ABSTRACT:
The present invention is directed to circuitry which uses a reference voltage and a reference current to produce a resistance which stays essentially constant even when the temperature of the device varies. The circuitry of a preferred embodiment consists of a resistor and a n-channel FET. The source of the FET is connected to ground, and the drain is connected to one terminal of the resistor. The other terminal of the resistor is connected to a reference current source and to the noninverting terminal of an operation amplifier. The inverting terminal of the operational amplifier is connected to a reference voltage. The output of the operational amplifier is connected to the gate of the FET. The value of the resistor is chosen such that the voltage drop across the FET (I.e., V.sub.ds) is small so that the FET operates in the linear region. A resistive element is composed of the resistor and the on-resistance of the FET. the resistance of the resistive element is held constant by means of a feedback loop from the operational amplifier.

REFERENCES:
patent: 4251743 (1981-02-01), Hareyama
patent: 4280091 (1981-07-01), Hiltner
patent: 4602207 (1986-07-01), Kim et al.
patent: 4674369 (1987-06-01), Bowers et al.
patent: 4680535 (1987-07-01), Talmor
patent: 4864216 (1989-10-01), Kalata et al.

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